Re: COSMAC Elf switch panel using PCBs

2016-04-24 Thread Mike Stein
- Original Message - From: "Eric Smith" Sent: Sunday, April 24, 2016 1:38 AM > On Sat, Apr 23, 2016 at 8:18 PM, dwight wrote: >> You'd need to decide, LOAD is switch up or >> LOAD is switch down. > > Which still doesn't explain how a toggle

Re: COSMAC Elf switch panel using PCBs

2016-04-23 Thread Eric Smith
On Sat, Apr 23, 2016 at 8:18 PM, dwight wrote: > You'd need to decide, LOAD is switch up or > LOAD is switch down. Which still doesn't explain how a toggle (not momentary) can be said to have NC and NO pins. But at this point I'm flogging a dead horse. > Even if a single

Re: COSMAC Elf switch panel using PCBs

2016-04-23 Thread dwight
You'd need to decide, LOAD is switch up or LOAD is switch down. Even if a single wire, it needs to be debounced. Dwight From: cctalk on behalf of Eric Smith If it was momentary, it would have to be

Re: COSMAC Elf switch panel using PCBs

2016-04-23 Thread Eric Smith
On Sat, Apr 23, 2016 at 5:09 PM, dwight wrote: > Lf it were mine to make, it would be a spring return > momentary SPDT. NC would be ground and NO would be +5V, > as per the schematic. > I'm not sure what the manual says about it. > It is debounced with a jam latch, as per

Re: COSMAC Elf switch panel using PCBs

2016-04-23 Thread Brent Hilpert
I think you two are talking different versions of the Elf: Eric is talking specifically about the Elf 2000 whose circuit design has been modified considerably from the original version Dwight appears to be referring to. For my part, when I refurbished a period homebrew implementation (someone's

Re: COSMAC Elf switch panel using PCBs

2016-04-23 Thread dwight
Lf it were mine to make, it would be a spring return momentary SPDT. NC would be ground and NO would be +5V, as per the schematic. I'm not sure what the manual says about it. It is debounced with a jam latch, as per schematic. Tinker Dwight From: cctalk

Re: COSMAC Elf switch panel using PCBs

2016-04-23 Thread Eric Smith
On Sat, Apr 23, 2016 at 11:28 AM, dwight wrote: > I looked at the schematic pdf and it looks right. > The ground lead is the NC. It's an SPDT toggle. Neither the NC or NO pin of the switch should be tied to ground; it's the common pin that's grounded. So for a toggle switch,

Re: COSMAC Elf switch panel using PCBs

2016-04-23 Thread Mike Stein
From: "dwight" <dkel...@hotmail.com> To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk@classiccmp.org> Sent: Saturday, April 23, 2016 1:28 PM Subject: Re: COSMAC Elf switch panel using PCBs I looked at the schematic pdf and it looks right. The ground lead i

Re: COSMAC Elf switch panel using PCBs

2016-04-23 Thread dwight
Sent: Friday, April 22, 2016 5:06 PM To: General Discussion: On-Topic and Off-Topic Posts Subject: COSMAC Elf switch panel using PCBs I built a new Elf switch panel, but this time I used two printed circuit boards for the switches and the bezel. The bezel PCB has white soldermask with blac

COSMAC Elf switch panel using PCBs

2016-04-22 Thread Eric Smith
I built a new Elf switch panel, but this time I used two printed circuit boards for the switches and the bezel. The bezel PCB has white soldermask with black silkscreen. The next revision will have black soldermask with white silkscreen, and the legend font, weight, and positioning changed to